# Combination 2

## Topic

Statistics and Probability

## Definition

A combination is a selection of items from a larger pool where order does not matter.

## Description

Combinations are used in probability to determine the number of ways to select items from a set, which is crucial in fields like cryptography and game theory.

The formula for combinations is

where n is the total number of items, and r is the number of items to choose.

Understanding combinations is important for students to solve problems involving selections and arrangements without regard to order.

For a complete collection of terms related to Probability and Statistics click on this link: Probability and Statistics Collection.

Common Core Standards CCSS.MATH.CONTENT.6.SP.B.4, CCSS.MATH.CONTENT.6.SP.A.2, CCSS.MATH.CONTENT.HSS.ID.A.1, CCSS.MATH.CONTENT.HSS.ID.A.2, CCSS.MATH.CONTENT.HSS.ID.A.3, CCSS.MATH.CONTENT.HSS.ID.A.4 6 - 12 Algebra     • Probability and Data Analysis         • Probability 2013 permutations, combinations, probability, definitions, glossary term